<template>
  <div class="player" v-show="playlist.length>0">
    <transition
      name="normal"
      @enter="enter"
      @after-enter="afterEnter"
      @leave="leave"
      @after-leave="afterLeave"
    >
      <div class="normal-player" v-show="fullScreen">
        <div class="background">
          <img width="100%" height="100%" :src="currentSong.image" />
        </div>
        <div class="top">
          <div class="back" @click="back">
            <i class="icon-back"></i>
          </div>
          <h1 class="title" v-html="currentSong.name"></h1>
          <h2 class="subtitle" v-html="currentSong.singer"></h2>
        </div>
        <div
          class="middle"
          @touchstart.prevent="middleTouchStart"
          @touchmove.prevent="middleTouchMove"
          @touchend="middleTouchEnd"
        >
          <!-- cd -->
          <div class="middle-l" ref="middleL">
            <div class="cd-wrapper" ref="cdWrapper">
              <div class="cd" :class="cdCls">
                <img class="image" :src="currentSong.image" />
              </div>
            </div>
            <div class="playing-lyric-wrapper">
              <div class="playing-lyric">{{playingLyric}}</div>
            </div>
          </div>
          <!-- 歌词列表 -->
          <Scroll class="middle-r" ref="lyricList" :data="currentLyric && currentLyric.lines">
            <div class="lyric-wrapper">
              <div v-if="currentLyric">
                <p
                  ref="lyricLine"
                  class="text"
                  :class="{'current':currentLineNum === index}"
                  v-for="(line,index) in currentLyric.lines"
                  v-bind:key="line.time"
                >{{line.txt}}</p>
              </div>
            </div>
          </Scroll>
        </div>
        <!-- 英语播放控制 -->
        <div class="bottom">
          <div class="dot-wrapper">
            <span class="dot" :class="{'active':currentShow==='cd'}"></span>
            <span class="dot" :class="{'active':currentShow==='lyric'}"></span>
          </div>
          <div class="progress-wrapper">
            <span class="time time-l">{{format(currentTime)}}</span>
            <div class="progress-bar-wrapper">
              <progress-bar :percent="percent" @percentChange="onProgressBarChange"></progress-bar>
            </div>
            <span class="time time-r">{{format(currentSong.duration)}}</span>
          </div>
          <div class="operators">
            <div class="icon i-left" @click="changeMode">
              <i :class="iconMode"></i>
            </div>
            <div class="icon i-left" :class="disableCls">
              <i @click="prev" class="icon-prev"></i>
            </div>
            <div class="icon i-center" :class="disableCls">
              <i @click="togglePlaying" :class="playIcon"></i>
            </div>
            <div class="icon i-right" :class="disableCls">
              <i @click="next" class="icon-next"></i>
            </div>
            <div class="icon i-right">
              <i
                class="icon"
                :class="getFavoriteIcon(currentSong)"
                @click="toggleFavorite(currentSong)"
              ></i>
            </div>
          </div>
        </div>
      </div>
    </transition>
    <transition name="mini">
      <div class="mini-player" @click="open" v-show="!fullScreen">
        <div class="icon">
          <img :class="cdCls" width="40" height="40" :src="currentSong.image" />
        </div>
        <div class="text">
          <h2 class="name" v-html="currentSong.name"></h2>
          <p class="desc" v-html="currentSong.singer"></p>
        </div>
        <div class="control">
          <progress-circle :radius="radius" :percent="percent">
            <i @click.stop="togglePlaying" class="icon-mini" :class="miniIcon"></i>
          </progress-circle>
        </div>
        <div class="control" @click="showPlaylist">
          <i class="icon-playlist"></i>
        </div>
      </div>
    </transition>
    <!-- 播放列表 -->
    <playlist ref="playlist"></playlist>
    <!-- 播发器 -->
    <audio
      ref="audio"
      :src="url"
      @play="ready"
      @error="error"
      @timeupdate="updateTime"
      @ended="end"
    ></audio>
  </div>
</template>

<script type="text/ecmascript-6">
import { mapGetters, mapMutations, mapActions } from "vuex";
import { prefixStyle } from "common/js/dom";
import { getVkey } from "api/singer";
import { ERR_OK } from "api/config";
import { setUrl } from "common/js/song";
import animations from "create-keyframe-animation"; // js编写cs动画
import ProgressBar from "base/progress-bar/progress-bar";
import ProgressCircle from "base/progress-circle/progress-circle";
import { playMode } from "common/js/config";
import Lyric from "lyric-parser";
import Scroll from "base/scroll/scroll";
import Playlist from "components/playlist/playlist";
import { playerMixin } from "common/js/mixin";

const transform = prefixStyle("transform");
const transitionDuration = prefixStyle("transitionDuration");
export default {
  mixins: [playerMixin],
  created() {
    this.touch = {};
  },
  data() {
    return {
      radius: 32,
      url: "x",
      songReady: false,
      currentLineNum: 0,
      currentLyric: null,
      currentShow: "cd",
      playingLyric: "",
      currentTime: 0 // 当前播发时间
    };
  },
  components: {
    ProgressBar,
    ProgressCircle,
    Scroll,
    Playlist
  },
  computed: {
    cdCls() {
      return this.playing ? "play" : "play pause";
    },
    playIcon() {
      return this.playing ? "icon-pause" : "icon-play";
    },
    miniIcon() {
      return this.playing ? "icon-pause-mini" : "icon-play-mini";
    },
    ...mapGetters(["fullScreen", "playing", "currentIndex"]),
    disableCls() {
      // 控制播发的下一曲，上一曲，播发按钮可用状态
      return this.songReady ? "" : "disable";
    },
    percent() {
      // 计算当前音乐播发百分比
      return this.currentTime / this.currentSong.duration;
    }
  },
  methods: {
    /**
     * 设置播放为mini播放
     */
    back() {
      this.setFullScreen(false);
    },
    getLyric() {
      this.currentSong
        .getLyric()
        .then(lyric => {
          if (this.currentSong.lyric !== lyric) {
            return;
          }
          this.currentLyric = new Lyric(lyric, this.handleLyric);
          if (this.playing) {
            this.currentLyric.play();
          }
        })
        .catch(() => {
          this.currentLyric = null;
          this.playingLyric = "";
          this.currentLineNum = 0;
        });
    },
    handleLyric({ lineNum, txt }) {
      this.currentLineNum = lineNum;
      if (lineNum > 5) {
        let lineEl = this.$refs.lyricLine[lineNum - 5];
        this.$refs.lyricList.scrollToElement(lineEl, 1000);
      } else {
        this.$refs.lyricList.scrollTo(0, 0, 1000);
      }
      this.playingLyric = txt;
    },
    ...mapMutations({
      setFullScreen: "SET_FULL_SCREEN"
    }),
    ...mapActions(["savePlayHistory"]),
    /**
     * 设置播放为全屏播放
     */
    open() {
      this.setFullScreen(true);
    },
    enter(el, done) {
      const { x, y, scale } = this._getPosAndScale();
      let animation = {
        0: {
          transform: `translate3d(${x}px,${y}px,0) scale(${scale})`
        },
        60: {
          transform: `translate3d(0,0,0) scale(1.1)`
        },
        100: {
          transform: `translate3d(0,0,0) scale(1)`
        }
      };
      animations.registerAnimation({
        name: "move",
        animation,
        presets: {
          duration: 400,
          easing: "linear"
        }
      });
      animations.runAnimation(this.$refs.cdWrapper, "move", done);
    },
    afterEnter() {
      animations.unregisterAnimation("move");
      this.$refs.cdWrapper.style.animation = "";
    },
    leave(el, done) {
      this.$refs.cdWrapper.style.transition = "all 0.4s";
      const { x, y, scale } = this._getPosAndScale();
      this.$refs.cdWrapper.style[
        transform
      ] = `translate3d(${x}px,${y}px,0) scale(${scale})`;
      this.$refs.cdWrapper.addEventListener("transitionend", done);
    },
    afterLeave() {
      this.$refs.cdWrapper.style.transition = "";
      this.$refs.cdWrapper.style[transform] = "";
    },
    next() {
      if (!this.songReady) {
        return;
      }
      if (this.playlist.length === 1) {
        this.loop();
        return;
      } else {
        let index = this.currentIndex + 1;
        if (index === this.playlist.length) {
          index = 0;
        }
        this.setCurrentIndex(index);
        if (!this.playing) {
          this.togglePlaying();
        }
      }
      this.songReady = false;
    },
    prev() {
      if (!this.songReady) {
        return;
      }
      if (this.playlist.length === 1) {
        this.loop();
        return;
      } else {
        let index = this.currentIndex - 1;
        if (index === -1) {
          index = this.playlist.length - 1;
        }
        this.setCurrentIndex(index);
        if (!this.playing) {
          this.togglePlaying();
        }
      }
      this.songReady = false;
    },
    ready() {
      this.songReady = true;
      this.savePlayHistory(this.currentSong);
    },
    error() {
      this.songReady = true;
    },
    updateTime(e) {
      // 更新音乐播发时间
      this.currentTime = e.target.currentTime;
    },
    end() {
      if (this.mode === playMode.loop) {
        this.loop();
      } else {
        this.next();
      }
    },
    loop() {
      this.$refs.audio.currentTime = 0;
      this.$refs.audio.play();
      if (this.currentLyric) {
        this.currentLyric.seek(0);
      }
    },
    format(interval) {
      interval = interval | 0;
      const minute = (interval / 60) | 0;
      const second = this._pad(interval % 60);
      return `${minute}:${second}`;
    },
    _getPosAndScale() {
      const targetWidth = 40;
      const paddingLeft = 40;
      const paddingBottom = 30;
      const paddingTop = 80;
      const width = window.innerWidth * 0.8;
      const scale = targetWidth / width;
      const x = -(window.innerWidth / 2 - paddingLeft);
      const y = window.innerHeight - paddingTop - width / 2 - paddingBottom;
      return {
        x,
        y,
        scale
      };
    },
    togglePlaying() {
      if (!this.songReady) {
        return;
      }
      this.setPlayingState(!this.playing);
      if (this.currentLyric) {
        this.currentLyric.togglePlay();
      }
    },
    _pad(num, n = 2) {
      // 当num的位数小于n时，在前面添加少的‘0’
      let len = num.toString().length;
      while (len < n) {
        num = "0" + num;
        len++;
      }
      return num;
    },
    onProgressBarChange(percent) {
      const currentTime = this.currentSong.duration * percent;
      this.$refs.audio.currentTime = currentTime;
      if (!this.playing) {
        this.togglePlaying();
      }
      if (this.currentLyric) {
        this.currentLyric.seek(currentTime * 1000);
      }
    },
    middleTouchStart(e) {
      this.touch.initiated = true;
      const touch = e.touches[0];
      this.touch.startX = touch.pageX;
      this.touch.startY = touch.pageY;
    },
    middleTouchMove(e) {
      if (!this.touch.initiated) {
        return;
      }
      const touch = e.touches[0];
      const deltaX = touch.pageX - this.touch.startX;
      const deltaY = touch.pageY - this.touch.startY;
      if (Math.abs(deltaY) > Math.abs(deltaX)) {
        return;
      }
      const left = this.currentShow === "cd" ? 0 : -window.innerWidth;
      const offsetWidth = Math.min(
        0,
        Math.max(-window.innerWidth, left + deltaX)
      );
      this.touch.percent = Math.abs(offsetWidth / window.innerWidth);
      this.$refs.lyricList.$el.style[
        transform
      ] = `translate3d(${offsetWidth}px,0,0)`;
      this.$refs.lyricList.$el.style[transitionDuration] = 0;
      this.$refs.middleL.style.opacity = 1 - this.touch.percent;
      this.$refs.middleL.style[transitionDuration] = 0;
    },
    middleTouchEnd() {
      let offsetWidth;
      let opacity;
      if (this.currentShow === "cd") {
        if (this.touch.percent > 0.1) {
          offsetWidth = -window.innerWidth;
          opacity = 0;
          this.currentShow = "lyric";
        } else {
          offsetWidth = 0;
          opacity = 1;
        }
      } else {
        if (this.touch.percent < 0.9) {
          offsetWidth = 0;
          this.currentShow = "cd";
          opacity = 1;
        } else {
          offsetWidth = -window.innerWidth;
          opacity = 0;
        }
      }
      const time = 300;
      this.$refs.lyricList.$el.style[
        transform
      ] = `translate3d(${offsetWidth}px,0,0)`;
      this.$refs.lyricList.$el.style[transitionDuration] = `${time}ms`;
      this.$refs.middleL.style.opacity = opacity;
      this.$refs.middleL.style[transitionDuration] = `${time}ms`;
      this.touch.initiated = false;
    },
    /**
     * 显示播放列表
     */
    showPlaylist() {
      this.$refs.playlist.show();
    }
  },
  watch: {
    currentSong(newSong, oldSong) {
      /* 避免从一首歌曲转到0首歌曲时，出错 */
      if (!newSong.id) {
        return;
      }
      if (newSong.id === oldSong.id) {
        return;
      }
      /* 停止上一首歌曲的歌词跳动 */
      if (this.currentLyric) {
        this.currentLyric.stop();
        this.currentTime = 0;
        this.playingLyric = "";
        this.currentLineNum = 0;
      }
      // 阉割版获取音乐，需要vkey
      if (newSong.vkey === null || newSong.vkey === undefined) {
        getVkey(this.currentSong.mid).then(res => {
          if (res.code === ERR_OK) {
            // 有些歌曲是获取不到的
            if (res.req_0.data.midurlinfo[0].vkey === "") {
              // 使可以进入下一曲
              this.songReady = true;
              this.next();
              return;
            }
            this.url = setUrl(
              this.currentSong,
              res.req_0.data.midurlinfo[0]
            ).url;
            /* 兼容微信 */
            clearTimeout(this.timer);
            this.timer = setTimeout(() => {
              this.$refs.audio.play();
              this.getLyric();
            }, 1000);
          }
        });
      }
    },
    playing(newPlaying) {
      const audio = this.$refs.audio;
      this.$nextTick(() => {
        // 这里的audio的地址可能为一个错误地址
        newPlaying ? audio.play() : audio.pause();
      });
    }
  }
};
</script>

<style scoped lang ="stylus" rel="stylesheet/stylus">
@import '~common/stylus/variable';
@import '~common/stylus/mixin';

.player {
  .normal-player {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 150;
    background: $color-background;

    .background {
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      opacity: 0.6;
      filter: blur(20px);
    }

    .top {
      position: relative;
      margin-bottom: 25px;

      .back {
        position: absolute;
        top: 0;
        left: 6px;
        z-index: 50;

        .icon-back {
          display: block;
          padding: 9px;
          font-size: $font-size-large-x;
          color: $color-theme;
          transform: rotate(-90deg);
        }
      }

      .title {
        width: 70%;
        margin: 0 auto;
        line-height: 40px;
        text-align: center;
        no-wrap();
        font-size: $font-size-large;
        color: $color-text;
      }

      .subtitle {
        line-height: 20px;
        text-align: center;
        font-size: $font-size-medium;
        color: $color-text;
      }
    }

    .middle {
      position: fixed;
      width: 100%;
      top: 80px;
      bottom: 170px;
      white-space: nowrap;
      font-size: 0;

      .middle-l {
        display: inline-block;
        vertical-align: top;
        position: relative;
        width: 100%;
        height: 0;
        padding-top: 80%;

        .cd-wrapper {
          position: absolute;
          left: 10%;
          top: 0;
          width: 80%;
          height: 100%;

          .cd {
            width: 100%;
            height: 100%;
            box-sizing: border-box;
            border: 10px solid rgba(255, 255, 255, 0.1);
            border-radius: 50%;

            &.play {
              animation: rotate 20s linear infinite;
            }

            &.pause {
              animation-play-state: paused;
            }

            .image {
              position: absolute;
              left: 0;
              top: 0;
              width: 100%;
              height: 100%;
              border-radius: 50%;
            }
          }
        }

        .playing-lyric-wrapper {
          width: 80%;
          margin: 30px auto 0 auto;
          overflow: hidden;
          text-align: center;

          .playing-lyric {
            height: 20px;
            line-height: 20px;
            font-size: $font-size-medium;
            color: $color-text-l;
          }
        }
      }

      .middle-r {
        display: inline-block;
        vertical-align: top;
        width: 100%;
        height: 100%;
        overflow: hidden;

        .lyric-wrapper {
          width: 80%;
          margin: 0 auto;
          overflow: hidden;
          text-align: center;

          .text {
            line-height: 32px;
            color: $color-text-l;
            font-size: $font-size-medium;

            &.current {
              color: $color-text;
              font-size: $font-size-large-x;
            }
          }
        }
      }
    }

    .bottom {
      position: absolute;
      bottom: 50px;
      width: 100%;

      .dot-wrapper {
        text-align: center;
        font-size: 0;

        .dot {
          display: inline-block;
          vertical-align: middle;
          margin: 0 4px;
          width: 8px;
          height: 8px;
          border-radius: 50%;
          background: $color-text-l;

          &.active {
            width: 20px;
            border-radius: 5px;
            background: $color-text-ll;
          }
        }
      }

      .progress-wrapper {
        display: flex;
        align-items: center;
        width: 80%;
        margin: 0px auto;
        padding: 10px 0;

        .time {
          color: $color-text;
          font-size: $font-size-small;
          flex: 0 0 30px;
          line-height: 30px;
          width: 30px;

          &.time-l {
            text-align: left;
          }

          &.time-r {
            text-align: right;
          }
        }

        .progress-bar-wrapper {
          flex: 1;
        }
      }

      .operators {
        display: flex;
        align-items: center;

        .icon {
          flex: 1;
          color: $color-theme;

          &.disable {
            color: $color-theme-d;
          }

          i {
            font-size: 30px;
          }
        }

        .i-left {
          text-align: right;
        }

        .i-center {
          padding: 0 20px;
          text-align: center;

          i {
            font-size: 40px;
          }
        }

        .i-right {
          text-align: left;
        }

        .icon-favorite {
          color: $color-sub-theme;
        }
      }
    }

    &.normal-enter-active, &.normal-leave-active {
      transition: all 0.4s;

      .top, .bottom {
        transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32);
      }
    }

    &.normal-enter, &.normal-leave-to {
      opacity: 0;

      .top {
        transform: translate3d(0, -100px, 0);
      }

      .bottom {
        transform: translate3d(0, 100px, 0);
      }
    }
  }

  .mini-player {
    display: flex;
    align-items: center;
    position: fixed;
    left: 0;
    bottom: 0;
    z-index: 180;
    width: 100%;
    height: 60px;
    background: $color-highlight-background;

    &.mini-enter-active, &.mini-leave-active {
      transition: all 0.4s;
    }

    &.mini-enter, &.mini-leave-to {
      opacity: 0;
    }

    .icon {
      flex: 0 0 40px;
      width: 40px;
      padding: 0 10px 0 20px;

      img {
        border-radius: 50%;

        &.play {
          animation: rotate 10s linear infinite;
        }

        &.pause {
          animation-play-state: paused;
        }
      }
    }

    .text {
      display: flex;
      flex-direction: column;
      justify-content: center;
      flex: 1;
      line-height: 20px;
      overflow: hidden;

      .name {
        margin-bottom: 2px;
        no-wrap();
        font-size: $font-size-medium;
        color: $color-text;
      }

      .desc {
        no-wrap();
        font-size: $font-size-small;
        color: $color-text-d;
      }
    }

    .control {
      flex: 0 0 30px;
      width: 30px;
      padding: 0 10px;

      .icon-play-mini, .icon-pause-mini, .icon-playlist {
        font-size: 30px;
        color: $color-theme-d;
      }

      .icon-mini {
        font-size: 32px;
        position: absolute;
        left: 0;
        top: 0;
      }
    }
  }
}

@keyframes rotate {
  0% {
    transform: rotate(0);
  }

  100% {
    transform: rotate(360deg);
  }
}
</style>
